A bass clef.
bass clef definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- a sign on a staff, indicating the position of F below middle C on the fourth line
- the range of notes on a staff so marked
bass clef definition by American Heritage Dictionary
A symbol indicating that the fourth line from the bottom of a staff represents the pitch of F below middle C. Also called F clef.